No batteries available for terracube 2e for seemingly years uk

Hello everybody. To keep using my terracube 2e I’d like a spare battery.
I’m completely flummoxed that it seems impossible to buy one. I’m in the UK.
I’ve been looking to buy one for a year and they’re not available.

I find this disappointing. If anyone knows where I can buy a good new battery please let me know.

Thank you.

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